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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9a486182df922ba1b8cb413cc7d014e8c5da8c313ea2a1b4d9e9e6898c9b355f' 
  AND token = 'FDeEok8XOw6twsVyYvkU6BCf2Eq4lKk8dcgBAjXGzII=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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