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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5e0ec0c5c3904412d696e977dbad823123ce267fdf7024e69cb92e9b91518bea' 
  AND token = 'Yurrke3D50T0MhmsJalxlFltY/dM7LlO7uIRVJ0me8k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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