Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '364f39398662635f41674fe40dd8d16e96f6b651a92519b4ca6aaecd7c37ee2d' 
  AND token = '4uBbnRR29J+zv/yFEba11Kag/CEdoZouZLU914nEDmQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00247

JSON explain

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