Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8e138ab61b494e2ca9024e2462263e6cc16b349711468ea35795f83a1bb0476b' 
  AND token = 'i5KLpdGYAAH7FPFIhsDun5HV6Kj1Hv96wtgfEByv6Mc=' 
  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"
    }
  }
}