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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8a7cd0dcf56657f9cb2850109752fbf01851533e31daabc4553af99a9f368e72' 
  AND token = '5bHRtT6tHu/rpYlQT9S26BegJggovd6H9DJXlYNvEdM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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