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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6b0f2905db9d115e174d61b3995909ba29c3f80fe64c74f71873742b67fca054' 
  AND token = 'EsGPG7tXrSneiW5aP/jd5ObgtRK6lfhVUa3WBT6qa1g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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