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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b6b4fdf34dd811b0bdd21b1bd4023f839e24a250703c4de36f85555058fb08ee' 
  AND token = 'XIfKkh6b1dvadrOMYKAcbqa/FgC+gbrA97Go1UpOs30=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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