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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e28627f5ad456f074b8e660d9fdf062aced7e81ec85e296f52dec269f7275bda' 
  AND token = '4+ER/zxGWJMc6oicb4rbAVhyEYm+pMu6Ul7EVWhsluA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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