Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '86b9e9a4d30e5e4a40489c2ce9e0e231642b2d12afc927cb6ec3e39cd6556d74' 
  AND token = '1+V4zr03PEmMeAZRSc144XQ/c9qdKtQVnDP/U3VSzEI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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