Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'de6fb5f70015f6d5ca2eeda5cc66c404a26b41ecc649ceef3b39df82d6569278' 
  AND token = 'efRnc5PnGDyN84V+Cq1Gg93Cjujj5c+LPPRO6Ewo5Ss=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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