Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aa3c1a705e6a0a213583e89b2a040c96be0b0e29c9af2994e13faf015d4ad10c' 
  AND token = 'YYMJz2Mbqy6EY146T9YL9iOaM2GRX/DgA+YqGVCoER4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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