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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'db55aa1cb7cc270ad7fa56abe1250304a6638134d7d6ca8e53558386158dc9dc' 
  AND token = 'Xsmz2GhwoMGN3RqEJYcKmO7Xxg7KMTPTD8Bzydi5w3Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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