Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '27aaaf9d4fb79d22cd4189cd878ab2cf16e1a5afdb2e47fcd9b3be4da52c3a5f' 
  AND token = 'J6DBE1i5U+aeoGqv/Ca1G44EY+OZ3qlX4PRsWKkSeC4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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