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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9da87399e63d3d61d225744beb4f1a67c1e3f2c647b7fc891298b3201f920abe' 
  AND token = 'kxvaA8Lrje/f6GOwfoteh6pDNPn+nhpOHv765CgA3oI=' 
  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"
    }
  }
}