Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '52ed1fb0c534e42328ed46aad08a15813571071464b99095fc413f587965f504' 
  AND token = 'vR9B8WbcuEDIaCcfapN0W2Ommw+zRNTfILn0NDBsuzM=' 
  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"
    }
  }
}