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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8c69ce2d0cf19e403646962c01a4becb6ff0fe6302f6c3dfc9969fa3803e4ce1' 
  AND token = 'Da5rjJvfeA1L+E2Z6fVOBOhiVmlrIU6/whEd9Ztu1hA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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