Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c445baf18f1c7a0d4cef12b0ee2712fbbd013df742aca3c869d4c34a40950c5e' 
  AND token = 'i5lGAGUg9mJptDJY3Lbh47tIZbCYug6kKQ/hl7u0aCU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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