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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '462e7f5a28cca5ef9e6cda2d5fcb89925540f0469e453ff9717eb3c2630638bd' 
  AND token = '2ENLeZ+qTvgqIgqjWP/SbWawC9iLQdxf69WNHtoIp04=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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