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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5a7679935ee0268f18edf96d43c133bd4ee621babce4452d0a75151e97d87f74' 
  AND token = 'CTXErIdJ2teb3hn5HZGimdhOz9IKYV/VjZ4Fn4j5yCA=' 
  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"
    }
  }
}