Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7bde152e60c865c57e2a0748fe9dce4c2db816a7c0b5e721b3316ed65c7c65c6' 
  AND token = 'd/nQZHfLqxaZ4sa+xAGrEI/Umkgyn7gIcyCicFQ7yUM=' 
  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"
    }
  }
}