SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd122c3f7efd0901964046e32d36de4f9cd88042592bbd2ef6f7d5898f3a3d0b8' 
  AND token = 'LaKiJi4U5nAyEmoWi1gPBOXfCWJzLnAM67FCvwlGsVg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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