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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1cf20eb0704bd1e4f3578206079587eb02ecb7813d2e5e1a46a121e28c0e01fb' 
  AND token = 'sXNlhRCsuw+T+BIASv/6CaORwz6LiVRmk42FQBXgGaA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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