Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7f0c721e80fdda51cd94f352d518d2feec4b431551eadcebdd6fd08ca2cdcf5b' 
  AND token = '5KcDYaleXFyL6lfp+N5c1Y51sgZBcIFMAevVE+0elFg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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