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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eb4befd50a55184d7ebf5df1ce088b58a7311a637bed7d2793f718e661846766' 
  AND token = 'f7ZgXFfEYLk9E//K0RGV/o7atUnXK53EyVjQmDv46T8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}