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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3aab5ee1ac43ea2dbcbc7081b6efd20ee4a7360f629f1f8ed311d931c67991db' 
  AND token = '5VT/3ClnQBun/xyZoP2eeRDBtbMV2j8v3XJcfSETg98=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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