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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '812f3c3b5dc3d967b2e455aa8cc89521c57c9a451541ef23a35cce5d72028764' 
  AND token = 'At+OXaNud/hMhXuSJ7EIClVCYId3j1qo1AObwe9mL8k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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