Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '81395362b27de50b1183fdceba593c1b279622d3ee52661180d67284d9c71765' 
  AND token = '33GwLiMbO2YCcOVwhrK84S64DcaZ2JYlV2kDm9VrerA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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