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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e3f3fe4187755f8e3e3f5d82f9093222a69ea3fb7c9f5a8d8e85a7872085d0f7' 
  AND token = 'Zf92EODdbbrGqpQMvAunBG7n/xkLpRdEc9KxBqOE+0E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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