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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '44c2cc54609e52d7ebb21af8c2f4c2fa19266e501d0515c8bcb5cdfa2cb07eab' 
  AND token = 'RPEu0ibqMUxMfMcRANQQu+UuGjmOqk7XmozHUy/g70c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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