Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '07a3f5a5dd091e5caa9ceaf2fc12d685af898438253ac28dfcbfbcef0664dc58' 
  AND token = 'tkZ925DDeaKPhXjmhyBvN/ZEuNbIiwRiYAhVX1ujvtM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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