SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '33e7dca2c0ea7d779f974695cc3599dcf81694c91de130385b56aa96a72b4479' 
  AND token = 'P5cCKr+Ln6RB/IgzXPYGEvfBQKPOHr6SLWIZp9wWYZc=' 
  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"
    }
  }
}