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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b9a557c9be2d19115bd6e454e9b2e99c5b0cc4f0482e1334b82da1dd7ed3df14' 
  AND token = 'Tg5CMAWFpYaJJWYuswWso6Ewf8D5JGaEulVEqU9984M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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