Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4a3a5d9ce7911126b2dbfed38059ebc690f86f8a569bc99051765799feb2d2ed' 
  AND token = '+0xSJQXyI3O2AiPkuMOYk/EGA1bOIx5Ry9VcmN5IQlc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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