SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e5e2c8e81766775c8e3583c8e5b4972a040525a0e47033b6f24022085ded2609' 
  AND token = '3Y/CiZ6zs0P1Srk0KXU/qvhLJ8G+u6KQGVLePuBjmHk=' 
  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"
    }
  }
}