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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4853e727504b5aba05e7e0db0e7def0214f38742fb3d64250e896d4bb19751e8' 
  AND token = 'Wz5fToB9dWXLr4Ke0XaGjjfaoSAHPoMa+Yh/mwTiYso=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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