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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '821bbf714c36e1b04fdc35e0bf30bab91ce2a8b4bfbaa39bba2383b6965324c2' 
  AND token = '6rbab9wbGbzp9KNrDj+6QDWDJe/tegJv9Qiq0yxTV7s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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