Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '245d48260cc9386e446b4c1a74b6301c5d9c2152e37d95a1f8ba7bfe31298186' 
  AND token = 'f1ih8KZN8ZI1ANe5Z603opcFJXYVInty9sFFoBSm0O4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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