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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7722426a947fdfa41b956cf669cae9084c5e1314366aa1eb4b7de68074583463' 
  AND token = 't3L5rOwZ3dUGhRsF9mb8MXg5NuePTN3M0thjw7weaqA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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