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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '79efed5b1af5a654d76efdcebb612f29bbaa87c4b18b644531f893e2e476f28a' 
  AND token = 'byDQyGA8EskMzNR12qhRiar8vA6Y9Vzx5pyT6oPs6V8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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