Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '344e0031034c20e2da4acad9e320a24eded5090e8fd92cc1265d9f622a95b0bc' 
  AND token = 'zAEf9gNORWAnGxTTNRNLUDBlIkj5M+k21U+CwiYeQcc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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