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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ca19648ba28d30e1d1ecdcc12b292fdb035dafdc49907869248ce2537dda700c' 
  AND token = 'QAiMmuo96PkkDQVyzXje5UxdE9NTtEtIW+CD3eTS6nE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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