SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2221936458bc22974afcabb471d18a4ea7bf8f56989b55efa5065e02164d982f' 
  AND token = 'CTSAQAGSmSY5ZKLRBF2JOK+iRR43hk6nuA7N3ZHpxqI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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