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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd286ee1bd5565b0696cc2138dcf7a2c1ac2431fc272233e77f506a8c8e64012b' 
  AND token = 'LialiO6n0T10qYMPz8n+iZY7YVALCl7jLrNIK7JlR98=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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