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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5acf86d6bd946df5f718932b8d0698c71378e60cd105cadd140f1a95bfa7ce2f' 
  AND token = 'e2ckyvSspEDVg2Q66K9MrGQIeynlMHk6sBZnxZneoDA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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