Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '40038019afdc7cbc6987ed046e3e191f8182d8a1e1e518bcfcff4de3a8ddfe2d' 
  AND token = 'L2rA+adzMUjJfhG0yYwvkI/bJMtueT1LY8rNBTL7IVc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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