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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '730ab48d6e7388834f7a5f09387c0358af3fa3faa0d9973bc96518c520e742a0' 
  AND token = 'oM9pp0uK5YMt7LZPq/FG3GKSr+J0W+SM2qNSsmHVJ+I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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