Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ac260471364feb8b07db6ffb23b751af7261b12641fc670f1cd0253f596e7372' 
  AND token = 'JwymI7UO5uteUUVsetHVvl1fhOAgb+hpXV+E2t9jEdE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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