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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '969afee9688eb9b8d3b07b0b8770014a384d7e6b180401ff0f06e20b42f6e13d' 
  AND token = 'VjLEjqyuoaRkBqM7kL660gc8weCbpOLCYFDzWFyKA9M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00010

JSON explain

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