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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fbc7d0eb4f6986ec530475f5410073ac1c95f80f59310f47aca665b925d585fc' 
  AND token = 'J43laZFeL6PmGbYN/yPmy8t795zy30EO/W723+udGOY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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