Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '28d766ab3a7031d9af1160c831a39cf0b2006e29f00d6bf53aae0ecda63f3f07' 
  AND token = '2CSFgEm1XcXEcPtpfb8fg9qe1mzxsuJ5f4OBNTufGDo=' 
  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"
    }
  }
}