Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '63ad1516784a2338f5e1029b28c47fdd29eb23fc190575857227f004f4a0ab74' 
  AND token = 'ptj4JdH8MtZ7EExwnxpfF1WBwKb2SX98wiNpYLsgQD0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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