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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4bcbfd67714707c51503414c8f65e144a54f9bf6a3fad9431f150a91411627bb' 
  AND token = '3z860lf60/pZ84bCxV1/iGPe31WaXESNCDSxQ3V3Nzo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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