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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '10ec27d7e8742e201067a1e5a0bf41f5bd0d997e608edce3967cc30746719611' 
  AND token = 'Ltf19GN1xVjMHKkdv4+baQ6jGzw2Ar5ZXJ7fvcP08t8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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