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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '14de5c1a774f9c9b04c0569f8e6a51e7caa2d36b235e66f6cae402abe27eba60' 
  AND token = 'BGse8Ki4epnfDh3FMHFXs2MyDINgoreBeZrnyE6jLck=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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