SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '651af7c6656bb07358ee9630749e017e885faff42cb20303d3cfde568855d159' 
  AND token = 'ongB+WITrQCvhejbp8AMQOwRg8uWbBuoBNjknV6PYKw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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