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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3f3065d907dc702c825ba8244a7fbe20aab22e272af151b61fa61611733e9918' 
  AND token = '8vLzqkuLdbN9WJf42FbdJk9Gn2cNq/ovL/WyGkYIZ2g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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