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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3207b0a45162dd43f1b9bee932e28f8c623066c173ae81e917a8e6fa32af44f5' 
  AND token = 'VBLwWZivb8F091OlRDAG7wVDrTis5cepE/bDMpy3c7U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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